Osbourne women working on 'secret project' for last 10 years

Kelly Osbourne is working on a "secret project" with her mother Sharon Osbourne.

The 'Fashion Police' co-host, who is getting ready to marry her vegetarian chef boyfriend Matthew Mosshart, revealed the duo are preparing to unveil a mysterious new venture, which they have been working on for a decade.

The 28-year-old star tweeted on Friday: "My mum & I have been working on a project together for over 10 years today is the day it is finally happening! Cant wait 4 you guys to see!! (sic)"

My mum & I have been working on a project together for over 10 years today is the day it is finally happening! Cant wait 4 you guys to see!!

She later hinted that the project involves fashion as she tweeted the message: "I can't wait for you guys to see what all this primping #DivaStyle is for!!!! I'm in #DragQueenHeaven!" along with a picture of herself being groomed by her makeup and hair stylists.

Kelly later admitted she was exhausted after a long day of working alongside her mother, 60, who is currently flying transatlantic several times a week to appear on the 'X Factor' in London and film her chat show 'The Talk' in Los Angeles.

My mum & I just worked a 24 hour day I'm so tired I feel like shit but it was so fun I feel like a dick for complaining!